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@article{MET_1991__38_2_176376, author = {B. Heiligers}, title = {A {Note} on {Connectedness} of {Block} {Designs.}}, journal = {Metrika}, pages = {377--381}, publisher = {mathdoc}, volume = {38}, number = {2}, year = {1991}, zbl = {0743.62070}, url = {http://geodesic.mathdoc.fr/item/MET_1991__38_2_176376/} }
B. Heiligers. A Note on Connectedness of Block Designs.. Metrika, Tome 38 (1991) no. 2, pp. 377-381. http://geodesic.mathdoc.fr/item/MET_1991__38_2_176376/